mbox series

[v6,0/7] Coresight for Kernel panic and watchdog reset

Message ID 20240105055840.1977897-1-lcherian@marvell.com
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Series Coresight for Kernel panic and watchdog reset | expand

Message

Linu Cherian Jan. 5, 2024, 5:58 a.m. UTC 
This patch series is rebased on v6.7-rc8 and is dependent
on the below patch.
- coresight: tmc: Make etr buffer mode user configurable from sysfs[1]

Changelog from v5:
* Fixed issues reported by CONFIG_DEBUG_ATOMIC_SLEEP
* Fixed a memory leak while reading data from /dev/tmc_etrx in
  READ_PREVBOOT mode
* Tested reading trace data from crashdump kernel

Changelog from v4:
* Device tree binding
  - Description is made more explicit on the usage of reserved memory
    region
  - Mismatch in memory region names in dts binding and driver fixed
  - Removed "mem" suffix from the memory region names
* Rename "struct tmc_register_snapshot" ->  "struct tmc_crash_metadata",
  since it contains more than register snapshot.
  Related variables are named accordingly.
* Rename struct tmc_drvdata members
   resrv_buf -> crash_tbuf
   metadata  -> crash_mdata
* Size field in metadata refers to RSZ register and hence indicates the
  size in 32 bit words. ETR metadata follows this convention, the same
  has been extended to ETF metadata as well.
* Added crc32 for more robust metadata and tracedata validation.
* Added/modified dev_dbg messages during metadata validation
* Fixed a typo in patch 5 commit description

Changelog from v3:
* Converted the Coresight ETM driver change to a named configuration.
  RFC tag has been removed with this change.
* Fixed yaml issues reported by "make dt_binding_check"
* Added names for reserved memory regions 0 and 1
* Added prevalidation checks for metadata processing
* Fixed a regression introduced in RFC v3
  - TMC Status register was getting saved wrongly
* Reverted memremap attribute changes from _WB to _WC to match
  with the dma map attributes
* Introduced reserved buffer mode specific .sync op.
  This fixes a possible crash when reserved buffer mode was used in
  normal trace capture, due to unwanted dma maintenance operations.

v4 is posted here:
https://lore.kernel.org/linux-arm-kernel/20230929133754.857678-1-lcherian@marvell.com/
Please note, v4 got wrongly tagged as v1 during transitioning to nonRFC
series.

Using Coresight for Kernel panic and Watchdog reset
===================================================
This patch series is about extending Linux coresight driver support to
address kernel panic and watchdog reset scenarios. This would help
coresight users to debug kernel panic and watchdog reset using
coresight trace data.

Coresight trace capture: Kernel panic
-------------------------------------